冶金工业热工参数的信息检测与控制

在加热炉的炉温控制系统中,使用传统的控制方法很难达到预期的目标,根据加热过程对温度等控制的要求,针对传统DCS系统存在的灵活性、稳定性等问题,通过设计以实现对工业控制现场多套生产装置中测点的实时监测与控制的优化方案,使得DCS网络控制系统具有更高的稳定性、精度和可靠性,对提高加热炉的加热效率和钢铁企业的经济效益很有积极意义。     

格灵化工基于SmartPro的DCS系统设计与应用

介绍北京和利时公司开发的SmartPro MACS Ⅲ型DCS系统在格灵化工硫酸装置中的应用.DCS系统包括硬件组成、软件设计及控制功能实现.该控制系统稳定可靠、控制精度高.在提高生产装置自动化水平的同时,使硫酸产品质量提高,生产成本大幅度降低.     

化工生产中DCS控制系统的应用研究

随着我国经济的不断发展,化工企业自动化技术水平逐渐上升,生产规模不断扩大。这就要求化工生产方面有自动化控制系统和智能化控制系统。现如今化工生产过程中DCS控制系统的应用极其广泛,DCS控制系统主要有两种结构形式,一是网络结构,二是体系结构。本文主要从DCS控制系统应用的角度出发,分析DCS控制系统的结构与功能,并对DCS控制系统的应用效果进行阐述。     

工业控制及管理计算机在硫酸生产的应用

简述了硫酸生产过程中DCS集散型控制系统和管理系统的组成及应用。并简要介绍了具有良好性能的IMP数据采集器。     

硫铁尾矿处理项目DCS控制系统的设计

介绍含硫铁矿尾矿焙烧生产硫酸的工艺概况,重点阐述基于上海新华XDC800系列DCS控制器的控制系统的设计,以实现对整个工艺过程的全自动监控.     

DCS自控仪表系统的运行管理

炼油化工生产过程中,应用DCS自控仪表系统实现化工生产过程的自动控制和管理,加强对DCS自控控制系统的日常管理及维护,提高仪表自控系统的安全运行效率,满足炼油化工生产的需求。     

硫酸生产系统大联锁优化改进实践

分析了硫精矿制酸系统中关键装置异常运行时存在的安全环保风险以及对后续工序的危害,通过对现用联锁系统的现场实际运行情况了解和电气控制技术分析,找出硫酸生产系统大联锁存在的设计缺陷和技术漏洞,最终在DCS控制系统的配合下对硫酸大联锁控制进行优化改进,既完善了硫酸大联锁系统的防护功能,又提高了生产装置运行的安全性和可靠性,避免了生产系统出现大范围的设备故障和对周边环境的严重污染,同时也保障了硫酸生产系统运行的连续稳定,降低生产成本,增加了一定的社会效益和经济效益。     

基于DCS控制系统的化工自动化控制

在科学技术不断发展过程中,化工行业的生产技术也在不断改革,DCS控制系统是一种以计算机为基础的自动化系统,在化工生产中可以有效提高生产效率,提高设备的精准性,在化工生产中,这种自动化控制系统得到了广泛的应用。DCS控制系统在应用过程中,帮助工作人员提供了非常好的支撑,提高了化工生产的水平,具有非常高的优势特点。本文结合DCS系统概述,分析了化工生产中DCS控制系统应用现状以及存在的问题,对化工自动化系统设计方案进行分析,并探讨了DCS控制系统在化工自动化控制中的有效应用。     

7.5万t/a焦油加工项目的自动控制

针对7.5万t／a焦油加工项目自动控制的要求和产品特点,在生产过程控制方案的设计中采用了集散控制系统（DCS）,提出了具体的实施方法,并详细介绍了DCS系统的组成、功能和特点。控制方案成功应用于生产运行,控制系统运行准确、可靠。     

DCS在化工生产控制中的应用

通过分布式控制系统（DCS）在化工生产控制中的应用,简单介绍了DCS控制系统特性。针对：亡艺特点和控制要求,具体介绍了几个DCS控制方案的实施过程。运行结果表明,该系统具有良好的稳定性、实时性。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。